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<div id="overview"><a href="../../../../../../../api/org/jboss/netty/handler/codec/socks/SocksCommonUtils.html">View Javadoc</a></div><pre>

<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright 2012 The Netty Project</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * The Netty Project licenses this file to you under the Apache License,</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> * version 2.0 (the "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * with the License. You may obtain a copy of the License at:</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *   <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * License for the specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * under the License.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <strong class="jxr_keyword">package</strong> org.jboss.netty.handler.codec.socks;
<a class="jxr_linenumber" name="17" href="#17">17</a>  
<a class="jxr_linenumber" name="18" href="#18">18</a>  <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../../org/jboss/netty/handler/codec/socks/SocksCommonUtils.html">SocksCommonUtils</a> {
<a class="jxr_linenumber" name="19" href="#19">19</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/handler/codec/socks/SocksRequest.html">SocksRequest</a> UNKNOWN_SOCKS_REQUEST = <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/handler/codec/socks/UnknownSocksRequest.html">UnknownSocksRequest</a>();
<a class="jxr_linenumber" name="20" href="#20">20</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../../../org/jboss/netty/handler/codec/socks/SocksResponse.html">SocksResponse</a> UNKNOWN_SOCKS_RESPONSE = <strong class="jxr_keyword">new</strong> <a href="../../../../../../org/jboss/netty/handler/codec/socks/UnknownSocksResponse.html">UnknownSocksResponse</a>();
<a class="jxr_linenumber" name="21" href="#21">21</a>  
<a class="jxr_linenumber" name="22" href="#22">22</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> SECOND_ADDRESS_OCTET_SHIFT = 16;
<a class="jxr_linenumber" name="23" href="#23">23</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> FIRST_ADDRESS_OCTET_SHIFT = 24;
<a class="jxr_linenumber" name="24" href="#24">24</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> THIRD_ADDRESS_OCTET_SHIFT = 8;
<a class="jxr_linenumber" name="25" href="#25">25</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> XOR_DEFAULT_VALUE = 0xff;
<a class="jxr_linenumber" name="26" href="#26">26</a>  
<a class="jxr_linenumber" name="27" href="#27">27</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="28" href="#28">28</a>  <em class="jxr_javadoccomment">     * A constructor to stop this class being constructed.</em>
<a class="jxr_linenumber" name="29" href="#29">29</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="30" href="#30">30</a>      <strong class="jxr_keyword">private</strong> <a href="../../../../../../org/jboss/netty/handler/codec/socks/SocksCommonUtils.html">SocksCommonUtils</a>() {
<a class="jxr_linenumber" name="31" href="#31">31</a>          <em class="jxr_comment">//NOOP</em>
<a class="jxr_linenumber" name="32" href="#32">32</a>      }
<a class="jxr_linenumber" name="33" href="#33">33</a>  
<a class="jxr_linenumber" name="34" href="#34">34</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String intToIp(<strong class="jxr_keyword">int</strong> i) {
<a class="jxr_linenumber" name="35" href="#35">35</a>          <strong class="jxr_keyword">return</strong> String.valueOf(i &gt;&gt; FIRST_ADDRESS_OCTET_SHIFT &amp; XOR_DEFAULT_VALUE) + '.' +
<a class="jxr_linenumber" name="36" href="#36">36</a>                 (i &gt;&gt; SECOND_ADDRESS_OCTET_SHIFT &amp; XOR_DEFAULT_VALUE) + '.' +
<a class="jxr_linenumber" name="37" href="#37">37</a>                 (i &gt;&gt; THIRD_ADDRESS_OCTET_SHIFT &amp; XOR_DEFAULT_VALUE) + '.' +
<a class="jxr_linenumber" name="38" href="#38">38</a>                 (i &amp; XOR_DEFAULT_VALUE);
<a class="jxr_linenumber" name="39" href="#39">39</a>      }
<a class="jxr_linenumber" name="40" href="#40">40</a>  
<a class="jxr_linenumber" name="41" href="#41">41</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">char</strong>[] ipv6conseqZeroFiller = {':', ':'};
<a class="jxr_linenumber" name="42" href="#42">42</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">char</strong> ipv6hextetSeparator = ':';
<a class="jxr_linenumber" name="43" href="#43">43</a>  
<a class="jxr_linenumber" name="44" href="#44">44</a>      <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_comment">    * Convert numeric IPv6 to compressed format, where</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <em class="jxr_comment">    * the longest sequence of 0's (with 2 or more 0's) is replaced with "::"</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_comment">    */</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String ipv6toCompressedForm(byte[] src) {
<a class="jxr_linenumber" name="49" href="#49">49</a>          assert src.length == 16;
<a class="jxr_linenumber" name="50" href="#50">50</a>          <em class="jxr_comment">//Find the longest sequence of 0's</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>          <em class="jxr_comment">//start of compressed region (hextet index)</em>
<a class="jxr_linenumber" name="52" href="#52">52</a>          <strong class="jxr_keyword">int</strong> cmprHextet = -1;
<a class="jxr_linenumber" name="53" href="#53">53</a>          <em class="jxr_comment">//length of compressed region</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>          <strong class="jxr_keyword">int</strong> cmprSize = 0;
<a class="jxr_linenumber" name="55" href="#55">55</a>          <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> hextet = 0; hextet &lt; 8;) {
<a class="jxr_linenumber" name="56" href="#56">56</a>              <strong class="jxr_keyword">int</strong> curByte = hextet * 2;
<a class="jxr_linenumber" name="57" href="#57">57</a>              <strong class="jxr_keyword">int</strong> size = 0;
<a class="jxr_linenumber" name="58" href="#58">58</a>              <strong class="jxr_keyword">while</strong> (curByte &lt; src.length &amp;&amp; src[curByte] == 0
<a class="jxr_linenumber" name="59" href="#59">59</a>                      &amp;&amp; src[curByte + 1] == 0) {
<a class="jxr_linenumber" name="60" href="#60">60</a>                  curByte += 2;
<a class="jxr_linenumber" name="61" href="#61">61</a>                  size++;
<a class="jxr_linenumber" name="62" href="#62">62</a>              }
<a class="jxr_linenumber" name="63" href="#63">63</a>              <strong class="jxr_keyword">if</strong> (size &gt; cmprSize) {
<a class="jxr_linenumber" name="64" href="#64">64</a>                  cmprHextet = hextet;
<a class="jxr_linenumber" name="65" href="#65">65</a>                  cmprSize = size;
<a class="jxr_linenumber" name="66" href="#66">66</a>              }
<a class="jxr_linenumber" name="67" href="#67">67</a>              hextet = curByte / 2 + 1;
<a class="jxr_linenumber" name="68" href="#68">68</a>          }
<a class="jxr_linenumber" name="69" href="#69">69</a>          <strong class="jxr_keyword">if</strong> (cmprHextet == -1 || cmprSize &lt; 2) {
<a class="jxr_linenumber" name="70" href="#70">70</a>              <em class="jxr_comment">//No compression can be applied</em>
<a class="jxr_linenumber" name="71" href="#71">71</a>              <strong class="jxr_keyword">return</strong> ipv6toStr(src);
<a class="jxr_linenumber" name="72" href="#72">72</a>          }
<a class="jxr_linenumber" name="73" href="#73">73</a>          StringBuilder sb = <strong class="jxr_keyword">new</strong> StringBuilder(39);
<a class="jxr_linenumber" name="74" href="#74">74</a>          ipv6toStr(sb, src, 0, cmprHextet);
<a class="jxr_linenumber" name="75" href="#75">75</a>          sb.append(ipv6conseqZeroFiller);
<a class="jxr_linenumber" name="76" href="#76">76</a>          ipv6toStr(sb, src, cmprHextet + cmprSize, 8);
<a class="jxr_linenumber" name="77" href="#77">77</a>          <strong class="jxr_keyword">return</strong> sb.toString();
<a class="jxr_linenumber" name="78" href="#78">78</a>      }
<a class="jxr_linenumber" name="79" href="#79">79</a>  
<a class="jxr_linenumber" name="80" href="#80">80</a>      <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="81" href="#81">81</a>  <em class="jxr_comment">    * Convert numeric IPv6 to standard (non-compressed) format.</em>
<a class="jxr_linenumber" name="82" href="#82">82</a>  <em class="jxr_comment">    *</em>
<a class="jxr_linenumber" name="83" href="#83">83</a>  <em class="jxr_comment">    * Borrowed from Inet6Address.java #numericToTextFormat(byte[])</em>
<a class="jxr_linenumber" name="84" href="#84">84</a>  <em class="jxr_comment">    * Changed StringBuffer -&gt; StringBuilder and ":" -&gt; ':' for performance.</em>
<a class="jxr_linenumber" name="85" href="#85">85</a>  <em class="jxr_comment">    */</em>
<a class="jxr_linenumber" name="86" href="#86">86</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String ipv6toStr(byte[] src) {
<a class="jxr_linenumber" name="87" href="#87">87</a>          assert src.length == 16;
<a class="jxr_linenumber" name="88" href="#88">88</a>          StringBuilder sb = <strong class="jxr_keyword">new</strong> StringBuilder(39);
<a class="jxr_linenumber" name="89" href="#89">89</a>          ipv6toStr(sb, src, 0, 8);
<a class="jxr_linenumber" name="90" href="#90">90</a>          <strong class="jxr_keyword">return</strong> sb.toString();
<a class="jxr_linenumber" name="91" href="#91">91</a>      }
<a class="jxr_linenumber" name="92" href="#92">92</a>  
<a class="jxr_linenumber" name="93" href="#93">93</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> ipv6toStr(StringBuilder sb, byte[] src,
<a class="jxr_linenumber" name="94" href="#94">94</a>                                    <strong class="jxr_keyword">int</strong> fromHextet, <strong class="jxr_keyword">int</strong> toHextet) {
<a class="jxr_linenumber" name="95" href="#95">95</a>          <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = fromHextet; i &lt; toHextet; i++) {
<a class="jxr_linenumber" name="96" href="#96">96</a>              sb.append(Integer.toHexString(src[i &lt;&lt; 1] &lt;&lt; 8 &amp; 0xff00
<a class="jxr_linenumber" name="97" href="#97">97</a>                      | src[(i &lt;&lt; 1) + 1] &amp; 0xff));
<a class="jxr_linenumber" name="98" href="#98">98</a>              <strong class="jxr_keyword">if</strong> (i &lt; toHextet - 1) {
<a class="jxr_linenumber" name="99" href="#99">99</a>                  sb.append(ipv6hextetSeparator);
<a class="jxr_linenumber" name="100" href="#100">100</a>             }
<a class="jxr_linenumber" name="101" href="#101">101</a>         }
<a class="jxr_linenumber" name="102" href="#102">102</a>     }
<a class="jxr_linenumber" name="103" href="#103">103</a> }
</pre>
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